CN217278153U - Flow control device for measuring small flow corrosive gas - Google Patents
Flow control device for measuring small flow corrosive gas Download PDFInfo
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- CN217278153U CN217278153U CN202123128291.7U CN202123128291U CN217278153U CN 217278153 U CN217278153 U CN 217278153U CN 202123128291 U CN202123128291 U CN 202123128291U CN 217278153 U CN217278153 U CN 217278153U
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Abstract
The flow control device for measuring the small-flow corrosive gas comprises a gas inlet pipe and a gas-liquid conversion component, wherein the gas-liquid conversion component is connected with a three-way joint, the gas-liquid conversion component consists of a liquid storage sleeve and a gas-liquid conversion joint arranged on the liquid storage sleeve, a corrosion-resistant liquid in the liquid storage sleeve and a gas-liquid isolation pipe, the upper joint part in the upper part and the lower part of the gas-liquid conversion joint is provided with a gas inlet through hole for leading the corrosive gas into the liquid storage sleeve and a gas-liquid isolation pipe which is connected and inserted into the corrosion-resistant liquid gas, and the pressure measuring through hole for leading the corrosion-resistant liquid into a pressure gauge is formed. The device is used for preventing the pressure gauge from directly contacting or separating from the pressure gauge to play a role in corrosion resistance when measuring small-flow corrosive gas, and the capillary tube is arranged in the gas inlet pipe to enlarge the pressure display range of the pressure gauge so as to improve the flow control precision; the device can ensure that the service life of the pressure gauge is prolonged to hundreds of times or ten years or so from the original application of several times or several days in the flow control of chlorine and the like, and the measurement cost of small-flow corrosive gas in the sampling, inspection or chemical test work is greatly reduced.
Description
Technical Field
The utility model relates to a gas flow control device, in particular to a gas flow control device for small-flow corrosive gas,
The flow control device is used for measuring the small-flow corrosive gas, and can prevent corrosion of the pressure gauge and facilitate flow regulation.
Background
At present, in chemical and pharmaceutical industries, the corrosion of small flows comprising chlorine, hydrogen sulfide, hydrogen chloride, hydrogen bromide and the like
Sampling, testing or testing of etching gas is also mostly performed with rotameters. Take liquid chlorine produced by electrolysis as an example
When the nitrogen trichloride is sampled, a nitrogen trichloride sampling device is used, and the device comprises a flowmeter,
A dark box provided with a gas absorption tube and an absorption bottle for measuring the sodium hydroxide solution. When chlorine gas enters the NaOH solution absorption bottle
In this case, the chlorine gas input and its input flow rate must be determined according to the amount of the NaOH solution to control the reaction rate. In need of
In the case of a flow meter, the chlorine gas feed rate is determined by manually observing the voids entrained in the chlorine gas flowing through the meter per second
The number of bubbles formed by gas is calculated and is conventionally accepted to be based on 4-5 bubbles observed per second. This is achieved by
Similarly, if the chlorine gas input flow is determined to be 240-
Several bubbles, so as to require 4-5 observations per second, and the cumulative time of one minute will be nearly 240 bubbles and 300 bubbles, which can satisfy the above requirements
The requirement of input flow. The problem is how to accurately count these bubbles within 1 second, which is a matter of phase in operation
When the operation is difficult, the flowmeter has no operability and reliability, has no anti-corrosion function and is used in corrosive gas
The lower work can be damaged after a few times.
On the other hand, for small flows of corrosive gas, the pressure range of the corrosive gas can be used
The pressure measurement is carried out with a conventional pressure gauge of 0-0.01-0.02 … … 0.08.08-0.09-1 MPa, but due to the conventional pressure
In the measurement of said corrosive gas, the meter is directly contacted with said gas, so that it can quickly lose its measurement accuracy due to corrosion
. In addition, in the long-term application of the conventional pressure gauge, the size of the inlet caliber of the conventional pressure gauge is found to be constant, and all the set inlet calibers are set
For the usual pressure measurement under natural pressure, the measurement value range is narrow when the pressure measuring device is used for measuring the pressure of low-flow gas
It is difficult to use the observed pressure to accurately control the flow of gas. Thus, conventional pressure gauges such as
Which prevents corrosion of small flow rate of corrosive gas and enlarges the display range of pressure to easily and correctly adjust and control gas
The flow of the system is to satisfy the long-term urgent needs of related enterprises and workers thereof: how to improve small flow corrosive gas measurement
The measuring accuracy and the service life of the measuring instrument are unsatisfactory.
Disclosure of Invention
The object of the utility model is to overcome the aforesaid and utilize flowmeter and manometer to the not enough in the inspection of low discharge corrosive gas, especially low discharge corrosive gas directly causes the part corruption and causes measuring accuracy's decline and the pressure measurement value display range narrowly when using conventional manometer condition to carry out pressure measurement under the condition, so that can not control gaseous flow through pressure accurately, and provide a flow control device that measures low discharge corrosive gas and use.
The purpose of the utility model is realized through such conception: the flow control device comprises a corrosive gas inlet pipe and a gas-liquid conversion component, wherein the middle of the corrosive gas inlet pipe is connected with a three-way joint of a first through hole and a second through hole which are positioned on the same axis, the gas-liquid conversion component comprises a liquid storage sleeve, a gas-liquid conversion joint arranged on the opening end of the liquid storage sleeve, anticorrosive liquid arranged in the liquid storage sleeve and a gas-liquid isolating pipe, the gas-liquid conversion joint is in a step shape and is provided with an upper joint part with a larger diameter and a lower joint part which protrudes out of the upper joint part and has a smaller diameter, the peripheral surface of the upper joint part is provided with a gas inlet through hole for introducing measurement gas and connecting a third through hole protruding out of the middle of the three-way joint and a pressure measurement through hole for indirectly measuring the pressure of the gas and communicating a pressure gauge, and the opposite inner sides of the gas inlet through hole and the pressure measurement through hole are respectively provided with a gas inlet channel and a pressure measurement channel which extend downwards to the bottom surface of the lower joint part, the upper end of the gas-liquid isolating pipe is arranged at a passage port of the pressure measuring passage, and the lower end of the gas-liquid isolating pipe extends below the liquid level of the anticorrosive liquid stored in the liquid storage sleeve.
The flow control device as described above, wherein the corrosion preventing liquid is fluorine oil.
The flow control device as described above, wherein the diameters of the intake passage and the pressure measurement passage are in the front of the half 1, in the front of the half 1=2-3.5, the diameters of the intake through hole and the pressure measurement through hole are in the front of the half 2, and in the front of the half 2=2-3.5 mm.
The flow rate control device as described above, wherein the anticorrosive liquid is contained in the reservoir pipe in an amount of two thirds or more of a height of a space contained therein.
The flow rate control device as described above, wherein the gas-liquid conversion joint has a hexagonal peripheral surface, the gas inlet through hole and the pressure measuring through hole are located on two adjacent hexagonal surfaces, the measuring channel connected to the pressure measuring through hole is located at the center of the gas-liquid conversion joint, and the gas inlet channel connected to the gas inlet through hole is located in parallel at a position beside the measuring channel at the center of the gas-liquid conversion joint.
The flow rate control device as described above, wherein the inner diameter of the gas-liquid separation pipe is 3 mm in half, and 3=1.5-2.5 mm in half.
The flow control device as described above, wherein the air inlet pipe further includes a capillary tube, the capillary tube is installed on the air inlet pipe on the outlet side of the three-way joint, the aperture of the capillary tube is 4 mm in front and 4 mm in front, and 4= 0.1-0.5 mm in front and in back.
The flow rate control device as described above, wherein the capillary tube is installed in the intake pipe, and the inner diameter of the intake pipe is 5 mm in the front and 5 mm in the rear, and 5=3-6 mm in the front.
The flow control device is characterized in that the lower end or the tail end of the gas-liquid isolating pipe extends into the liquid level of the anti-corrosion liquid stored in the liquid storage sleeve and is at least 1-2 mm away from the bottom surface of the liquid storage sleeve.
The device has the advantages that when the device is used for measuring small-flow corrosive gas, the pressure gauge and the small-flow corrosive gas are enabled to be in gas-liquid conversion
The corrosive gas does not directly contact or separate from the contact, so that the corrosion prevention effect on the pressure gauge is fully realized and/or the gas is introduced or discharged
The capillary tube is arranged in the tube to enlarge the pressure display range of the pressure gauge in a flow stopping mode, so that the precision of flow control is improved
Accordingly, the reliability of flow control of the small-flow corrosive gas in the sampling process is ensured. In particular, it is possible to use,
for the device, not only can the pressure gauge be used for chlorine, hydrogen sulfide, hydrogen chloride, hydrogen bromide and the like
A series of control of the flow rate of the corrosive gas, and compared with the original use mode, the service life of the pressure gauge
Originally, the application can be maintained for a plurality of times or a plurality of days, the application is improved to hundreds of times or about ten years, and the application is greatly reduced
The measurement cost of the small-flow corrosive gas in sampling, inspection or chemical test work is reduced.
Drawings
Fig. 1 is a front view of a gas-liquid conversion member according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is A cross-sectional view A-O-A of FIG. 2;
FIG. 4 is a cross-sectional view of the air inlet pipe of the present invention;
fig. 5 is an assembly diagram of the gas-liquid conversion member, the gas inlet pipe and the pressure gauge of the present invention.
Detailed Description
In order to make the technical problems to be solved and the technical effects to be achieved by the technical solution of the present invention clearer, the following will be described in detail by embodiments with reference to the accompanying drawings. It should be noted that the embodiments described below are only a part of the present invention, and not all of it. All other embodiments obtained from this solution will also belong to the scope of protection of the invention, without any inventive step by the skilled person.
Example one
Please refer to fig. 1 to 4, which are the first embodiment of the present invention, the flow control device for measuring small flow corrosive gas comprises an air inlet pipe 1 for corrosive gas and a gas-liquid conversion member 3 of a three-way joint 2 connected with a first through hole and a second through hole on the same axis, wherein the gas-liquid conversion member 3 comprises a liquid storage sleeve 31, a gas-liquid conversion joint 32 installed on an opening end 311 of the liquid storage sleeve 31, an anti-corrosive liquid 33 and a gas-liquid isolation pipe 34 installed in the liquid storage sleeve 31, the gas-liquid conversion joint 32 is in a step shape and has an upper joint 321 with a larger diameter and a lower joint 322 protruding from the upper joint 321 with a smaller diameter, wherein the upper joint 321 is provided with a gas inlet through hole 3211 for introducing the measured gas and being capable of inserting into the three-way joint and connecting with the third through hole protruding from the middle of the three-way joint, and a pressure measuring hole 3211 for indirectly measuring the gas pressure and inserting the pressure gauge and communicating the pressure measuring hole The through hole 3212, the air inlet passage 3221 and the pressure measuring passage 3222 extending downward to the bottom surface of the lower joint part are respectively arranged on the opposite inner sides of the air inlet through hole 3211 and the pressure measuring through hole 3212 to communicate the air inlet passage 3211 and the pressure measuring passage 3221, and the pressure measuring through hole 3212 and the pressure measuring passage 3222. The gas-liquid isolating pipe 34 is installed and fixed at the passage opening of the pressure measuring passage 3222 through the upper end thereof, and the lower end thereof extends below the liquid level of the antiseptic liquid 33 stored in the liquid storage sleeve 31. Generally, the liquid storage sleeve 31 is connected with the gas-liquid conversion joint 32 in a sealing manner through the opening end 311 of the liquid storage sleeve 31 and the lower joint part 322 of the gas-liquid conversion joint 32 which are oppositely provided with threads.
Furthermore, in the present invention, the anti-corrosion liquid 33 is fluorine oil, and the amount of the anti-corrosion liquid 33 placed in the liquid storage sleeve 31 is generally at least two thirds of the height of the liquid storage sleeve with the liquid level as a reference.
The diameters of the air inlet through hole 3211 and the pressure measuring through hole 3212 are the same and are in the same direction, which is 1=2-3.5 mm in the same direction, the diameters of the air inlet channel 3221 and the pressure measuring channel 3222 are the same and are in the same direction, which is 2=2-3.5 mm in the same direction.
The inner diameter of the gas-liquid isolating pipe 34 is in the same direction as 3, in the same direction as 3=1.5-2.5 mm, and the lower end of the gas-liquid isolating pipe extends below the liquid level of the anti-corrosion liquid 33 stored in the liquid storage sleeve 31 to be at least 1-2 mm away from the bottom surface of the liquid storage sleeve 31.
Preferably, in order to facilitate the mounting and storage of the gas-liquid conversion joint 32 on the liquid storage sleeve 31 and the connection with an external pressure gauge, etc., the circumferential surface of the gas-liquid conversion joint 32 is hexagonal, the gas inlet 3211 and the pressure measuring through 3212 are located on two adjacent hexagonal surfaces, the measuring channel 3222 connected to the pressure measuring through 3212 is located in the center of the gas-liquid conversion joint, and the gas inlet 3221 connected to the gas inlet 3211 is located in parallel beside the measuring channel 3222 in the center of the gas-liquid conversion joint.
For the application condition of the gas-liquid conversion component 3 under the low-flow corrosive gas, the pressure measuring through hole 3212 is connected with the pressure gauge, the gas inlet through hole 3211 is connected with the middle through hole of the three-way joint 2, the corrosive gas input by the gas inlet pipe 1 sequentially enters the space above the liquid level of the anticorrosive liquid 33 in the liquid storage sleeve 31 through the three-way joint 2, the gas inlet through hole 3211 and the gas inlet channel 3221 and generates pressure on the liquid level to press the anticorrosive liquid in the liquid storage sleeve into the gas-liquid isolating pipe 34 and flow into the pressure gauge through the gas-liquid isolating pipe to indirectly measure the pressure of the corrosive gas, that is, the low-flow corrosive gas such as chlorine gas is prevented from directly contacting the pressure gauge during measurement but contacting a safety solution such as fluorine oil.
Example two
Please refer to fig. 1 to 5, which are further improvements of the first embodiment of the present invention, wherein the air inlet pipe 1 further includes a capillary tube 4 installed on the air inlet pipe at the rear side or the outlet side of the three-way joint 2, and the aperture, i.e. the inner diameter is far in the direction of 4, and far in the direction of 4= 0.1-0.5 mm.
This embodiment adds a capillary 4 in intake pipe 1 and utilizes the principle of damming of pipeline, namely in original intake pipe 1 the internal diameter in 5 in the same, 5=3-6 mm's pipeline in adds one section capillary and makes gas flow increase through damming, corresponding pressure increase, so that manometer P digital display promotes the scope of higher value and broad relatively from lower value and narrower scope, and reach and be favorable to the accurate control to the flow of low discharge corrosive gas in the actual experimentation.
Claims (9)
1. A flow control device for measuring small-flow corrosive gas is characterized by comprising a corrosive gas inlet pipe and a gas-liquid conversion component, wherein the middle of the corrosive gas inlet pipe is connected with a three-way joint head of a first through hole and a second through hole which are positioned on the same axis, the gas-liquid conversion component comprises a liquid storage sleeve, a gas-liquid conversion joint arranged on the opening end of the liquid storage sleeve, anticorrosive liquid arranged in the liquid storage sleeve and a gas-liquid isolating pipe, the gas-liquid conversion joint is in a step shape and is provided with an upper joint part with a larger diameter and a lower joint part which protrudes out of the upper joint part and has a smaller diameter, the peripheral surface of the upper joint part is provided with a gas inlet through hole which is used for introducing measuring gas and is connected with a third through hole protruding out of the middle of the three-way joint head and a pressure measuring through hole which is used for indirectly measuring gas pressure and communicating a pressure gauge, and the opposite inner sides of the gas inlet through hole and the pressure measuring through hole are respectively provided with a gas inlet channel and a pressure measuring channel which extend downwards to the bottom surface of the lower joint part, the upper end of the gas-liquid isolating pipe is arranged at a passage port of the pressure measuring passage, and the lower end of the gas-liquid isolating pipe extends below the liquid level of the anticorrosive liquid stored in the liquid storage sleeve.
2. The flow control device of claim 1, wherein the corrosion inhibiting liquid is a fluorine oil.
3. The flow control device according to claim 1, wherein the diameter of the inlet passage and the pressure measurement passage is in the middle of 1, in the middle of 1=2-3.5, the diameter of the inlet through hole and the pressure measurement through hole is in the middle of 2, and in the middle of 2=2-3.5 mm.
4. The flow control device according to claim 1, wherein the anticorrosive liquid is contained in the reservoir in an amount of more than two thirds of the height of the space contained therein.
5. The flow control device according to claim 1, wherein the gas-liquid conversion joint has a hexagonal peripheral surface, and the gas inlet through hole and the pressure measuring through hole are formed in two adjacent hexagonal surfaces, and the measuring passage to which the pressure measuring through hole is connected is formed in the center of the gas-liquid conversion joint, and the gas inlet passage to which the gas inlet through hole is connected is formed in a position parallel to and beside the measuring passage in the center of the gas-liquid conversion joint.
6. The flow control device according to claim 1, wherein the inner diameter of the gas-liquid separation pipe is 3 mm in length and 3=1.5-2.5 mm in length.
7. The flow control device of claim 1, wherein the inlet tube further comprises a capillary tube, the capillary tube being mounted on the inlet tube on the outlet side of the three-way joint, the diameter of the capillary tube being 4 mm in length and 4= 0.1-0.5 mm in length.
8. A flow control device according to claim 7 wherein the capillary tube is mounted in an inlet pipe having an internal diameter which extends in 5 and in 5=3-6 mm.
9. The flow control device according to claim 1, wherein the lower end or the end of the gas-liquid isolating pipe extends below the liquid level of the antiseptic liquid stored in the liquid storage sleeve by at least 1-2 mm from the bottom surface of the liquid storage sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123128291.7U CN217278153U (en) | 2021-12-14 | 2021-12-14 | Flow control device for measuring small flow corrosive gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123128291.7U CN217278153U (en) | 2021-12-14 | 2021-12-14 | Flow control device for measuring small flow corrosive gas |
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| Publication Number | Publication Date |
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| CN217278153U true CN217278153U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123128291.7U Active CN217278153U (en) | 2021-12-14 | 2021-12-14 | Flow control device for measuring small flow corrosive gas |
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